l.e.d.s can help save you on energy. the u.s. department of energy estimates you will save 60% on your electricity costs to light a six-foot tree over the holidays. consumer reports found l.e.d. lights run cooler and it means you can use them on plastic and glass instead of the glass bulbs. this makes them more durable and pose less of a fire risk and l.e.d. bulbs last longer. most of them will lost more than 4,000 hours. you could still be using the same bulbs in 40 years. how about that? they cost more, but it might be worth it. if you have a question you would like us to consider for ask liz, send it to us. >> wow, they will outlive just about any christmas decoration. >> yeah. nice to know they will be still lit. >> good to see you. >> thank you. >>> let's go back to the ellipse and rejoin the national tree lighting ceremony where we have renee fleming performing on stage. ♪ >>> see something, send something, that's the message virginia state police are putting out to smartphone users. rolling out an app to prevent crime. d